The company employs more than 2,400 people and manages a payroll of about $100 million.

In a statement, the company said a review of annualised salaries paid to its employees during the 2017-18 financial year revealed workers were owed $1.6 million in wages, which will be made in top-up payments.

"We are now notifying eligible employees of their personal outcomes, and will begin processing payments immediately," the statement said.

"We will separately be reaching out to former employees in the coming days."

Correct payrolls 'an industry-wide challenge'

Many hospitality industry workers are hired on annualised salaries, where employees agree to a yearly wage instead of being paid by the hour.

Annual salaries must be 25 per cent above the minimum rate set out in the award to cover "reasonable" overtime, penalties and other benefits.

The salary must also be more than what staff would be entitled to if they were being paid by the hour, claiming all entitlements like overtime and penalties.

Any shortfall must be made up at the end of the financial year or when an employee leaves the business.